- Instrument Response Function Down to 17.8 ps
- Extremly Low Timing Jitter (<8 ps RMS)
- Spectral Sensitivity from Visible to Mid-IR (0.5 - 2.5 µm)
- Extremly Low Dark Count Rate (Typ. <10 cps)
- Quantum Efficiency > 85 %
- No Afterpulsing
Description
Superconducting niobium nitride detectors (SNSPD) offer sensitivity up to infrared wavelengths and time resolution in the lower picosecond range. The detectors are based on a nano-structured ultra-thin layer (‘nanowire’) of niobium nitride. The structure is cooled down to a temperature of a few Kelvin so that the NbN film is superconducting. A DC current is sent through the device. When the NbN structure absorbs a photon superconduction is temporarily lost. The voltage over the structure then increases for a period of time on the order of a nanosecond. The amplified voltage pulse forms the output signal of the detector.
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